Sumit neglected to remit the fees in time and therefore had to pay a fine.

Answer: Option C

Exempted : free (a person or organization) from an obligation or liability imposed on others.
Refused : indicate or show that one is not willing to do something.
Failed : (of an undertaking or a relationship) not achieving its end or not lasting; unsuccessful.
Promised : assure someone that one will definitely do something or that something will happen.
Neglected : fail to care for properly.

Synonym of Neglected is Failed